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Finding the Fourth Proportional to 72,400.71, 99,917.64 and 40,136.69

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Solution

The fourth proportional to 72,400.71, 99,917.64 and 40,136.69 is: 55,391.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,400.71 : 99,917.64 = 40,136.69 : x
  2. Step 2: Convert to fraction form
    72,400.71/99,917.64 = 40,136.69/x
  3. Step 3: Cross multiply
    72,400.71x = 99,917.64 × 40,136.69
  4. Step 4: Simplify right side
    72,400.71x = 4,010,363,342.21
  5. Step 5: Solve for x
    x = 4,010,363,342.21/72,400.71
  6. Step 6: Final answer
    x = 55,391.22

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.